I bought it for 2480 yen per set. I use it myself, and it's incredibly warm! I've been using it for 6 years, and the warmth hasn't changed. I'm selling it because my father refused to buy it. If you want to be free from cold feet, please buy it. [No Power Needed, Warm Supporter, Made in Japan, Heat-Generating Supporter, No Power Needed, Easy to Put On and Take Off, Thinsulate, Thermogear, Just Wrap It Gently Around Your Ankle] This is a hot wrap supporter that provides a gentle, comfortable warmth. The skin side uses "Thermogear," a material with moisture-absorbing and heat-generating functions, which converts sweat and moisture into heat. The inner padding uses 3M's high-performance insulation material "Thinsulate," creating a structure that prevents the stored warmth from escaping. The outer fabric's reverse side is silver-coated to reflect body heat and maintain warmth. It's designed to provide warmth that you can feel in your daily life, even though it's thin. For ankles: Around the ankle is approximately 20-24cm Outer fabric: 100% nylon Lining: 35% cotton, 25% acrylic, 20% cupra, 20% polyester Inner padding: Thinsulate(R) Skin side: Thermogear(R) Outer fabric reverse side: Silver coating